Jack.



No. 683,290. Patented Sept. 24, |901.

J. A. JOHNSUN.

J A C K (Appumim mmmy 1e. 1901.)

(No Model.)

N i i 7 l s L? l l 55 L7 L' Mlm WTNESSES /N VENTOH W a .J5/'chi .foawm BY M1/f6) 0* Amm/frs me nomme PETERS do.. wom-LIM., wmmafqu, ni C.

UNITE STATES ATENT 102 Prion.

JOIIN ALFRED JOHNSON, OF IIOQUIAM, WASHINGTON, ASSIGNOR OF ONF- I-IALF TO ELKANAH W. KARR, OF SAME PLACE.

JACK.

SPECIFICATION forming part of Letters Patent No. 683,290, dated September 24, 1901. Application filed May 16, 1901. Serial No. 60,488. (No model.)

pawl f is carried in the stand and removably 5o To all whom t may concern:

Be it known that I, JOHN ALFRED JOHNSON, a citizen of the United States, and a resident of Hoquiam, in the county of Chehalis and State of Washington, have invented a new and Improved Jack, of which the following is a full, clear, and exact description.

This invention relates to a lifting-jack of that class in which a lever is used with certain ratchet-like Vgear to raise the bar, and the improvement lies in the form of the lever and the arrangement of the same with respect to the gear which acts on the bar.

This specification is a specific description of two forms of the invention, while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a side elevation of the invention, with parts broken away, ou the line l 2 of Fig. 2. Fig. 2 is a rear elevation thereof, and Fig. 3 is a modiiication.

The stand or body is formed of two cheekpieces or side plates a, mounted on a base a and having a space-bar 0.2 set in between them at their front edges and running up from the base to a point near the top. The stand has a top cap d3 extending across between the cheek-pieces. Within the stand is arranged to slide vertically the bar h, which has a stud h', fitted loosely in a slot a4 in the stand, whereby to guide the bar. The lower end of the bar has a lateral spur h2. The bar projects loosely through the cap a3 of the stand and carries a head b3 at its upper end. The front edge of the bar is formed with gearteeth, as indicated at b4. An object to be lifted may be engaged either with the head h3 or spur b2, as may be convenient.

Revolubly mounted within the stand, near the top thereof, is a transverse shaft c, earrying a pinion-gear CZ, in mesh with the teeth h4 of the bar h, and also carrying a ratchetwheel e, lying alongside of the bar b, the stand having at this 'point an offset portion a5 for the reception of the ratchet-wheel and other parte, to be hereinafter described. A

engages the ratchet-wheel e to prevent return movement.

g indicates the lever, which hasits end g reduced in thickness and widened. This end g' is formed with a diagonally-disposed slot g2, and said end of the lever is set into the odset portion a5 of the stand, the slot g2 receiving the shaft c and the end of the lever lying loosely against the adjacent side of the ratchet e. The inner extremity of the lever g is turned laterally to form a stud or shoulder g3, which when the lever is in the position shown in Fig. 1 lies against the periphery of the ratchet e. The working wall of this stud gS is ratcheted to match the teeth of the ratchet e. The lever g has a shoulder g4, arranged to strike the stand and limit the downward movement of the lever. When the parts are in the position shown in Fig. l, downward movement of the lever will turn the ratchetwheel and raise the bar of the jack. When the lever is moved upward to recover its grip on the ratchet, the slot gr2 will cause the stud gsautomatically to disengage the ratchet, and the instant downward pressure is applied the lever will fall back to the active position shown and a further movement will be imparted to the ratchet. If, desired, the lever may be titted with a spring h (see Fig. 8) to assist in the operations above described.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A jack having a stand, a bar, a device engaging the bar to raise it, a wheel connected with said device, and a lever having a diagonal slot receiving the axis of the wheel to form the fulcrum of the lever and the lever having a laterally-turned end forming a stud which engages the periphery of the wheel.

2. A jack having a stand, a bar, a device engaging the bar to raise it, a wheel connected with said device, and a lever having a slot receiving the axis of the wheel and having a part engaged with the periphery of the wheel, whereby to drive it.

3. A jack; having a stand, a bar, a device mounted on the st-:md and Working with the In testimony whereof I have signed my bar to mise it, said device moving around a. name to this specification in the presence of certain center, and a slidabiy-mounted lever, two subscribing Witnesses.

the fulerum of Which is coincident with the JOHN ALFRED JOHNSON. 5 Center of said. ba1-raising device, the lever Witnesses:

having a part engageznble with the bar-mis- M. M. WAKEFIELD,

ing device to actuate it. NICK. PATTERSON. 

